OER Parts offers a wide selection of Battery Accessories for your 1977 Mercury Capri. OER Parts offers 1977 Mercury Capri Battery Tender, 1977 Mercury Capri Battery Managment System, 1977 Mercury Capri Dual Battery System Controller Set, and 1977 Mercury Capri Battery Relocation Set. Battery Mat Battery Topper Battery Terminal Protectors Battery Post Cleaning Brush Battery Terminal Puller